Survive Up to 1 Month Without Head??

Cockroach can live for up to a month, without its head.

WHY??

(1) Cockroaches breath through spiracles for transferring oxygen to tissues but not controlled by brain as human does.
(2) Cockroach does not have blood pressure so cutting off the head does not lead to uncontrolled bleeding.
(3) They need much less food per day meal to last for whole month for not overactive.

However, they could die if only infected with mold, bacterium or virus.